You should work more on drawing fur. Using a brush just to add some lines across does not make it in any way better. It looks choppy and messy. Try using references to improve. Also using pure white and black for shading makes it boring and cold. You should use richer color palettes.

;w; this is so pretty, excellent job! ;w; If I could just say something real quick, cos I'm learning to draw fur too, the fur atop the forehead kind of goes straight up and note sideways. ;w;W;WWW;;; this is srsly awesome <3

If you want to look more like a realistic cat make the nose and the eyes bigger, if it isn't a long haired cat DON'T give it fluffy cheeks, inside of ears should have skin coloring like pink or darker grey, since I love drawing whiskers on cats maybe you should too? Its also anatomy . Cats fur is usually parted . I hope this helped? XD I know you wanted advice on fur but I thought you might want advice on relastic cats too.

Aww, I like the tears, very nice, but it looks like the fur on the face is a little rushed. Cats fur actually is parted in different places like this: [link]. You can see the fur by the eyes goes away from the eyes. The fur texture itself is pretty good, but maybe it could use some more lighting.

This actually turned out really good! The detail in the fur turned out well, and the tears look pretty good too. The fur looks a bit off in the some places where it needs to be brushing in different places, but it turned out really great overall!